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Latest 10 from a total of 10 transactions
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Upgrade | 12213896 | 1353 days ago | IN | 0 ETH | 0.38583874 | ||||
Accept Ownership | 12175162 | 1359 days ago | IN | 0 ETH | 0.00221705 | ||||
Transfer Ownersh... | 12175158 | 1359 days ago | IN | 0 ETH | 0.0044354 | ||||
Set Conversion F... | 11797325 | 1417 days ago | IN | 0 ETH | 0.0062522 | ||||
Set Conversion F... | 11626557 | 1444 days ago | IN | 0 ETH | 0.002157 | ||||
Add Liquidity | 11489515 | 1465 days ago | IN | 0 ETH | 0.00401697 | ||||
Accept Ownership | 11470533 | 1468 days ago | IN | 0 ETH | 0.00195363 | ||||
Add Liquidity | 11470492 | 1468 days ago | IN | 0 ETH | 0.01872461 | ||||
Transfer Ownersh... | 11470341 | 1468 days ago | IN | 0 ETH | 0.00425798 | ||||
Accept Ownership | 11470338 | 1468 days ago | IN | 0 ETH | 0.00210729 |
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11470334 | 1468 days ago | Contract Creation | 0 ETH |
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Similar Match Source Code This contract matches the deployed Bytecode of the Source Code for Contract 0x55069dd5...1aE27f6e6 The constructor portion of the code might be different and could alter the actual behaviour of the contract
Contract Name:
StandardPoolConverter
Compiler Version
v0.6.12+commit.27d51765
Optimization Enabled:
Yes with 200 runs
Other Settings:
default evmVersion
Contract Source Code (Solidity)
/** *Submitted for verification at Etherscan.io on 2020-12-14 */ // File: solidity/contracts/converter/ConverterVersion.sol // SPDX-License-Identifier: SEE LICENSE IN LICENSE pragma solidity 0.6.12; contract ConverterVersion { uint16 public constant version = 44; } // File: solidity/contracts/utility/interfaces/IOwned.sol pragma solidity 0.6.12; /* Owned contract interface */ interface IOwned { // this function isn't since the compiler emits automatically generated getter functions as external function owner() external view returns (address); function transferOwnership(address _newOwner) external; function acceptOwnership() external; } // File: solidity/contracts/converter/interfaces/IConverterAnchor.sol pragma solidity 0.6.12; /* Converter Anchor interface */ interface IConverterAnchor is IOwned { } // File: solidity/contracts/token/interfaces/IERC20Token.sol pragma solidity 0.6.12; /* ERC20 Standard Token interface */ interface IERC20Token { function name() external view returns (string memory); function symbol() external view returns (string memory); function decimals() external view returns (uint8); function totalSupply() external view returns (uint256); function balanceOf(address _owner) external view returns (uint256); function allowance(address _owner, address _spender) external view returns (uint256); function transfer(address _to, uint256 _value) external returns (bool); function transferFrom( address _from, address _to, uint256 _value ) external returns (bool); function approve(address _spender, uint256 _value) external returns (bool); } // File: solidity/contracts/converter/interfaces/IConverter.sol pragma solidity 0.6.12; /* Converter interface */ interface IConverter is IOwned { function converterType() external pure returns (uint16); function anchor() external view returns (IConverterAnchor); function isActive() external view returns (bool); function targetAmountAndFee( IERC20Token _sourceToken, IERC20Token _targetToken, uint256 _amount ) external view returns (uint256, uint256); function convert( IERC20Token _sourceToken, IERC20Token _targetToken, uint256 _amount, address _trader, address payable _beneficiary ) external payable returns (uint256); function conversionFee() external view returns (uint32); function maxConversionFee() external view returns (uint32); function reserveBalance(IERC20Token _reserveToken) external view returns (uint256); receive() external payable; function transferAnchorOwnership(address _newOwner) external; function acceptAnchorOwnership() external; function setConversionFee(uint32 _conversionFee) external; function withdrawTokens( IERC20Token _token, address _to, uint256 _amount ) external; function withdrawETH(address payable _to) external; function addReserve(IERC20Token _token, uint32 _ratio) external; // deprecated, backward compatibility function token() external view returns (IConverterAnchor); function transferTokenOwnership(address _newOwner) external; function acceptTokenOwnership() external; function connectors(IERC20Token _address) external view returns ( uint256, uint32, bool, bool, bool ); function getConnectorBalance(IERC20Token _connectorToken) external view returns (uint256); function connectorTokens(uint256 _index) external view returns (IERC20Token); function connectorTokenCount() external view returns (uint16); /** * @dev triggered when the converter is activated * * @param _type converter type * @param _anchor converter anchor * @param _activated true if the converter was activated, false if it was deactivated */ event Activation(uint16 indexed _type, IConverterAnchor indexed _anchor, bool indexed _activated); /** * @dev triggered when a conversion between two tokens occurs * * @param _fromToken source ERC20 token * @param _toToken target ERC20 token * @param _trader wallet that initiated the trade * @param _amount input amount in units of the source token * @param _return output amount minus conversion fee in units of the target token * @param _conversionFee conversion fee in units of the target token */ event Conversion( IERC20Token indexed _fromToken, IERC20Token indexed _toToken, address indexed _trader, uint256 _amount, uint256 _return, int256 _conversionFee ); /** * @dev triggered when the rate between two tokens in the converter changes * note that the event might be dispatched for rate updates between any two tokens in the converter * * @param _token1 address of the first token * @param _token2 address of the second token * @param _rateN rate of 1 unit of `_token1` in `_token2` (numerator) * @param _rateD rate of 1 unit of `_token1` in `_token2` (denominator) */ event TokenRateUpdate(IERC20Token indexed _token1, IERC20Token indexed _token2, uint256 _rateN, uint256 _rateD); /** * @dev triggered when the conversion fee is updated * * @param _prevFee previous fee percentage, represented in ppm * @param _newFee new fee percentage, represented in ppm */ event ConversionFeeUpdate(uint32 _prevFee, uint32 _newFee); } // File: solidity/contracts/converter/interfaces/IConverterUpgrader.sol pragma solidity 0.6.12; /* Converter Upgrader interface */ interface IConverterUpgrader { function upgrade(bytes32 _version) external; function upgrade(uint16 _version) external; } // File: solidity/contracts/token/interfaces/IDSToken.sol pragma solidity 0.6.12; /* DSToken interface */ interface IDSToken is IConverterAnchor, IERC20Token { function issue(address _to, uint256 _amount) external; function destroy(address _from, uint256 _amount) external; } // File: solidity/contracts/utility/Owned.sol pragma solidity 0.6.12; /** * @dev This contract provides support and utilities for contract ownership. */ contract Owned is IOwned { address public override owner; address public newOwner; /** * @dev triggered when the owner is updated * * @param _prevOwner previous owner * @param _newOwner new owner */ event OwnerUpdate(address indexed _prevOwner, address indexed _newOwner); /** * @dev initializes a new Owned instance */ constructor() public { owner = msg.sender; } // allows execution by the owner only modifier ownerOnly { _ownerOnly(); _; } // error message binary size optimization function _ownerOnly() internal view { require(msg.sender == owner, "ERR_ACCESS_DENIED"); } /** * @dev allows transferring the contract ownership * the new owner still needs to accept the transfer * can only be called by the contract owner * * @param _newOwner new contract owner */ function transferOwnership(address _newOwner) public override ownerOnly { require(_newOwner != owner, "ERR_SAME_OWNER"); newOwner = _newOwner; } /** * @dev used by a new owner to accept an ownership transfer */ function acceptOwnership() public override { require(msg.sender == newOwner, "ERR_ACCESS_DENIED"); emit OwnerUpdate(owner, newOwner); owner = newOwner; newOwner = address(0); } } // File: solidity/contracts/utility/Utils.sol pragma solidity 0.6.12; /** * @dev Utilities & Common Modifiers */ contract Utils { // verifies that a value is greater than zero modifier greaterThanZero(uint256 _value) { _greaterThanZero(_value); _; } // error message binary size optimization function _greaterThanZero(uint256 _value) internal pure { require(_value > 0, "ERR_ZERO_VALUE"); } // validates an address - currently only checks that it isn't null modifier validAddress(address _address) { _validAddress(_address); _; } // error message binary size optimization function _validAddress(address _address) internal pure { require(_address != address(0), "ERR_INVALID_ADDRESS"); } // verifies that the address is different than this contract address modifier notThis(address _address) { _notThis(_address); _; } // error message binary size optimization function _notThis(address _address) internal view { require(_address != address(this), "ERR_ADDRESS_IS_SELF"); } } // File: solidity/contracts/utility/interfaces/IContractRegistry.sol pragma solidity 0.6.12; /* Contract Registry interface */ interface IContractRegistry { function addressOf(bytes32 _contractName) external view returns (address); } // File: solidity/contracts/utility/ContractRegistryClient.sol pragma solidity 0.6.12; /** * @dev This is the base contract for ContractRegistry clients. */ contract ContractRegistryClient is Owned, Utils { bytes32 internal constant CONTRACT_REGISTRY = "ContractRegistry"; bytes32 internal constant BANCOR_NETWORK = "BancorNetwork"; bytes32 internal constant BANCOR_FORMULA = "BancorFormula"; bytes32 internal constant CONVERTER_FACTORY = "ConverterFactory"; bytes32 internal constant CONVERSION_PATH_FINDER = "ConversionPathFinder"; bytes32 internal constant CONVERTER_UPGRADER = "BancorConverterUpgrader"; bytes32 internal constant CONVERTER_REGISTRY = "BancorConverterRegistry"; bytes32 internal constant CONVERTER_REGISTRY_DATA = "BancorConverterRegistryData"; bytes32 internal constant BNT_TOKEN = "BNTToken"; bytes32 internal constant BANCOR_X = "BancorX"; bytes32 internal constant BANCOR_X_UPGRADER = "BancorXUpgrader"; IContractRegistry public registry; // address of the current contract-registry IContractRegistry public prevRegistry; // address of the previous contract-registry bool public onlyOwnerCanUpdateRegistry; // only an owner can update the contract-registry /** * @dev verifies that the caller is mapped to the given contract name * * @param _contractName contract name */ modifier only(bytes32 _contractName) { _only(_contractName); _; } // error message binary size optimization function _only(bytes32 _contractName) internal view { require(msg.sender == addressOf(_contractName), "ERR_ACCESS_DENIED"); } /** * @dev initializes a new ContractRegistryClient instance * * @param _registry address of a contract-registry contract */ constructor(IContractRegistry _registry) internal validAddress(address(_registry)) { registry = IContractRegistry(_registry); prevRegistry = IContractRegistry(_registry); } /** * @dev updates to the new contract-registry */ function updateRegistry() public { // verify that this function is permitted require(msg.sender == owner || !onlyOwnerCanUpdateRegistry, "ERR_ACCESS_DENIED"); // get the new contract-registry IContractRegistry newRegistry = IContractRegistry(addressOf(CONTRACT_REGISTRY)); // verify that the new contract-registry is different and not zero require(newRegistry != registry && address(newRegistry) != address(0), "ERR_INVALID_REGISTRY"); // verify that the new contract-registry is pointing to a non-zero contract-registry require(newRegistry.addressOf(CONTRACT_REGISTRY) != address(0), "ERR_INVALID_REGISTRY"); // save a backup of the current contract-registry before replacing it prevRegistry = registry; // replace the current contract-registry with the new contract-registry registry = newRegistry; } /** * @dev restores the previous contract-registry */ function restoreRegistry() public ownerOnly { // restore the previous contract-registry registry = prevRegistry; } /** * @dev restricts the permission to update the contract-registry * * @param _onlyOwnerCanUpdateRegistry indicates whether or not permission is restricted to owner only */ function restrictRegistryUpdate(bool _onlyOwnerCanUpdateRegistry) public ownerOnly { // change the permission to update the contract-registry onlyOwnerCanUpdateRegistry = _onlyOwnerCanUpdateRegistry; } /** * @dev returns the address associated with the given contract name * * @param _contractName contract name * * @return contract address */ function addressOf(bytes32 _contractName) internal view returns (address) { return registry.addressOf(_contractName); } } // File: solidity/contracts/utility/ReentrancyGuard.sol pragma solidity 0.6.12; /** * @dev This contract provides protection against calling a function * (directly or indirectly) from within itself. */ contract ReentrancyGuard { uint256 private constant UNLOCKED = 1; uint256 private constant LOCKED = 2; // LOCKED while protected code is being executed, UNLOCKED otherwise uint256 private state = UNLOCKED; /** * @dev ensures instantiation only by sub-contracts */ constructor() internal {} // protects a function against reentrancy attacks modifier protected() { _protected(); state = LOCKED; _; state = UNLOCKED; } // error message binary size optimization function _protected() internal view { require(state == UNLOCKED, "ERR_REENTRANCY"); } } // File: solidity/contracts/utility/SafeMath.sol pragma solidity 0.6.12; /** * @dev This library supports basic math operations with overflow/underflow protection. */ library SafeMath { /** * @dev returns the sum of _x and _y, reverts if the calculation overflows * * @param _x value 1 * @param _y value 2 * * @return sum */ function add(uint256 _x, uint256 _y) internal pure returns (uint256) { uint256 z = _x + _y; require(z >= _x, "ERR_OVERFLOW"); return z; } /** * @dev returns the difference of _x minus _y, reverts if the calculation underflows * * @param _x minuend * @param _y subtrahend * * @return difference */ function sub(uint256 _x, uint256 _y) internal pure returns (uint256) { require(_x >= _y, "ERR_UNDERFLOW"); return _x - _y; } /** * @dev returns the product of multiplying _x by _y, reverts if the calculation overflows * * @param _x factor 1 * @param _y factor 2 * * @return product */ function mul(uint256 _x, uint256 _y) internal pure returns (uint256) { // gas optimization if (_x == 0) return 0; uint256 z = _x * _y; require(z / _x == _y, "ERR_OVERFLOW"); return z; } /** * @dev Integer division of two numbers truncating the quotient, reverts on division by zero. * * @param _x dividend * @param _y divisor * * @return quotient */ function div(uint256 _x, uint256 _y) internal pure returns (uint256) { require(_y > 0, "ERR_DIVIDE_BY_ZERO"); uint256 c = _x / _y; return c; } } // File: solidity/contracts/utility/TokenHandler.sol pragma solidity 0.6.12; contract TokenHandler { bytes4 private constant APPROVE_FUNC_SELECTOR = bytes4(keccak256("approve(address,uint256)")); bytes4 private constant TRANSFER_FUNC_SELECTOR = bytes4(keccak256("transfer(address,uint256)")); bytes4 private constant TRANSFER_FROM_FUNC_SELECTOR = bytes4(keccak256("transferFrom(address,address,uint256)")); /** * @dev executes the ERC20 token's `approve` function and reverts upon failure * the main purpose of this function is to prevent a non standard ERC20 token * from failing silently * * @param _token ERC20 token address * @param _spender approved address * @param _value allowance amount */ function safeApprove( IERC20Token _token, address _spender, uint256 _value ) internal { (bool success, bytes memory data) = address(_token).call( abi.encodeWithSelector(APPROVE_FUNC_SELECTOR, _spender, _value) ); require(success && (data.length == 0 || abi.decode(data, (bool))), "ERR_APPROVE_FAILED"); } /** * @dev executes the ERC20 token's `transfer` function and reverts upon failure * the main purpose of this function is to prevent a non standard ERC20 token * from failing silently * * @param _token ERC20 token address * @param _to target address * @param _value transfer amount */ function safeTransfer( IERC20Token _token, address _to, uint256 _value ) internal { (bool success, bytes memory data) = address(_token).call( abi.encodeWithSelector(TRANSFER_FUNC_SELECTOR, _to, _value) ); require(success && (data.length == 0 || abi.decode(data, (bool))), "ERR_TRANSFER_FAILED"); } /** * @dev executes the ERC20 token's `transferFrom` function and reverts upon failure * the main purpose of this function is to prevent a non standard ERC20 token * from failing silently * * @param _token ERC20 token address * @param _from source address * @param _to target address * @param _value transfer amount */ function safeTransferFrom( IERC20Token _token, address _from, address _to, uint256 _value ) internal { (bool success, bytes memory data) = address(_token).call( abi.encodeWithSelector(TRANSFER_FROM_FUNC_SELECTOR, _from, _to, _value) ); require(success && (data.length == 0 || abi.decode(data, (bool))), "ERR_TRANSFER_FROM_FAILED"); } } // File: solidity/contracts/utility/interfaces/ITokenHolder.sol pragma solidity 0.6.12; /* Token Holder interface */ interface ITokenHolder is IOwned { function withdrawTokens( IERC20Token _token, address _to, uint256 _amount ) external; } // File: solidity/contracts/utility/TokenHolder.sol pragma solidity 0.6.12; /** * @dev This contract provides a safety mechanism for allowing the owner to * send tokens that were sent to the contract by mistake back to the sender. * * We consider every contract to be a 'token holder' since it's currently not possible * for a contract to deny receiving tokens. * * Note that we use the non standard ERC-20 interface which has no return value for transfer * in order to support both non standard as well as standard token contracts. * see https://github.com/ethereum/solidity/issues/4116 */ contract TokenHolder is ITokenHolder, TokenHandler, Owned, Utils { /** * @dev withdraws tokens held by the contract and sends them to an account * can only be called by the owner * * @param _token ERC20 token contract address * @param _to account to receive the new amount * @param _amount amount to withdraw */ function withdrawTokens( IERC20Token _token, address _to, uint256 _amount ) public virtual override ownerOnly validAddress(address(_token)) validAddress(_to) notThis(_to) { safeTransfer(_token, _to, _amount); } } // File: solidity/contracts/utility/Math.sol pragma solidity 0.6.12; /** * @dev This library provides a set of complex math operations. */ library Math { /** * @dev returns the largest integer smaller than or equal to the square root of a positive integer * * @param _num a positive integer * * @return the largest integer smaller than or equal to the square root of the positive integer */ function floorSqrt(uint256 _num) internal pure returns (uint256) { uint256 x = _num / 2 + 1; uint256 y = (x + _num / x) / 2; while (x > y) { x = y; y = (x + _num / x) / 2; } return x; } /** * @dev returns the smallest integer larger than or equal to the square root of a positive integer * * @param _num a positive integer * * @return the smallest integer larger than or equal to the square root of the positive integer */ function ceilSqrt(uint256 _num) internal pure returns (uint256) { uint256 x = floorSqrt(_num); return x * x == _num ? x : x + 1; } /** * @dev computes a reduced-scalar ratio * * @param _n ratio numerator * @param _d ratio denominator * @param _max maximum desired scalar * * @return ratio's numerator and denominator */ function reducedRatio( uint256 _n, uint256 _d, uint256 _max ) internal pure returns (uint256, uint256) { (uint256 n, uint256 d) = (_n, _d); if (n > _max || d > _max) { (n, d) = normalizedRatio(n, d, _max); } if (n != d) { return (n, d); } return (1, 1); } /** * @dev computes "scale * a / (a + b)" and "scale * b / (a + b)". */ function normalizedRatio( uint256 _a, uint256 _b, uint256 _scale ) internal pure returns (uint256, uint256) { if (_a <= _b) { return accurateRatio(_a, _b, _scale); } (uint256 y, uint256 x) = accurateRatio(_b, _a, _scale); return (x, y); } /** * @dev computes "scale * a / (a + b)" and "scale * b / (a + b)", assuming that "a <= b". */ function accurateRatio( uint256 _a, uint256 _b, uint256 _scale ) internal pure returns (uint256, uint256) { uint256 maxVal = uint256(-1) / _scale; if (_a > maxVal) { uint256 c = _a / (maxVal + 1) + 1; _a /= c; // we can now safely compute `_a * _scale` _b /= c; } if (_a != _b) { uint256 n = _a * _scale; uint256 d = _a + _b; // can overflow if (d >= _a) { // no overflow in `_a + _b` uint256 x = roundDiv(n, d); // we can now safely compute `_scale - x` uint256 y = _scale - x; return (x, y); } if (n < _b - (_b - _a) / 2) { return (0, _scale); // `_a * _scale < (_a + _b) / 2 < MAX_UINT256 < _a + _b` } return (1, _scale - 1); // `(_a + _b) / 2 < _a * _scale < MAX_UINT256 < _a + _b` } return (_scale / 2, _scale / 2); // allow reduction to `(1, 1)` in the calling function } /** * @dev computes the nearest integer to a given quotient without overflowing or underflowing. */ function roundDiv(uint256 _n, uint256 _d) internal pure returns (uint256) { return _n / _d + (_n % _d) / (_d - _d / 2); } /** * @dev returns the average number of decimal digits in a given list of positive integers * * @param _values list of positive integers * * @return the average number of decimal digits in the given list of positive integers */ function geometricMean(uint256[] memory _values) internal pure returns (uint256) { uint256 numOfDigits = 0; uint256 length = _values.length; for (uint256 i = 0; i < length; i++) { numOfDigits += decimalLength(_values[i]); } return uint256(10)**(roundDivUnsafe(numOfDigits, length) - 1); } /** * @dev returns the number of decimal digits in a given positive integer * * @param _x positive integer * * @return the number of decimal digits in the given positive integer */ function decimalLength(uint256 _x) internal pure returns (uint256) { uint256 y = 0; for (uint256 x = _x; x > 0; x /= 10) { y++; } return y; } /** * @dev returns the nearest integer to a given quotient * the computation is overflow-safe assuming that the input is sufficiently small * * @param _n quotient numerator * @param _d quotient denominator * * @return the nearest integer to the given quotient */ function roundDivUnsafe(uint256 _n, uint256 _d) internal pure returns (uint256) { return (_n + _d / 2) / _d; } /** * @dev returns the larger of two values * * @param _val1 the first value * @param _val2 the second value */ function max(uint256 _val1, uint256 _val2) internal pure returns (uint256) { return _val1 > _val2 ? _val1 : _val2; } } // File: solidity/contracts/utility/Time.sol pragma solidity 0.6.12; /* Time implementing contract */ contract Time { /** * @dev returns the current time */ function time() internal view virtual returns (uint256) { return block.timestamp; } } // File: solidity/contracts/converter/types/standard-pool/StandardPoolConverter.sol pragma solidity 0.6.12; /** * @dev This contract is a specialized version of the converter, which is * optimized for a liquidity pool that has 2 reserves with 50%/50% weights. */ contract StandardPoolConverter is ConverterVersion, IConverter, TokenHandler, TokenHolder, ContractRegistryClient, ReentrancyGuard, Time { using SafeMath for uint256; using Math for *; IERC20Token private constant ETH_RESERVE_ADDRESS = IERC20Token(0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE); uint256 private constant MAX_UINT128 = 2**128 - 1; uint256 private constant MAX_UINT112 = 2**112 - 1; uint256 private constant MAX_UINT32 = 2**32 - 1; uint256 private constant AVERAGE_RATE_PERIOD = 10 minutes; uint32 private constant PPM_RESOLUTION = 1000000; uint256 private __reserveBalances; IERC20Token[] private __reserveTokens; mapping(IERC20Token => uint256) private __reserveIds; IConverterAnchor public override anchor; // converter anchor contract uint32 public override maxConversionFee; // maximum conversion fee, represented in ppm, 0...1000000 uint32 public override conversionFee; // current conversion fee, represented in ppm, 0...maxConversionFee // average rate details: // bits 0...111 represent the numerator of the rate between reserve token 0 and reserve token 1 // bits 111...223 represent the denominator of the rate between reserve token 0 and reserve token 1 // bits 224...255 represent the update-time of the rate between reserve token 0 and reserve token 1 // where `numerator / denominator` gives the worth of one reserve token 0 in units of reserve token 1 uint256 public averageRateInfo; /** * @dev triggered after liquidity is added * * @param _provider liquidity provider * @param _reserveToken reserve token address * @param _amount reserve token amount * @param _newBalance reserve token new balance * @param _newSupply pool token new supply */ event LiquidityAdded( address indexed _provider, IERC20Token indexed _reserveToken, uint256 _amount, uint256 _newBalance, uint256 _newSupply ); /** * @dev triggered after liquidity is removed * * @param _provider liquidity provider * @param _reserveToken reserve token address * @param _amount reserve token amount * @param _newBalance reserve token new balance * @param _newSupply pool token new supply */ event LiquidityRemoved( address indexed _provider, IERC20Token indexed _reserveToken, uint256 _amount, uint256 _newBalance, uint256 _newSupply ); /** * @dev initializes a new StandardPoolConverter instance * * @param _anchor anchor governed by the converter * @param _registry address of a contract registry contract * @param _maxConversionFee maximum conversion fee, represented in ppm */ constructor( IConverterAnchor _anchor, IContractRegistry _registry, uint32 _maxConversionFee ) public ContractRegistryClient(_registry) validAddress(address(_anchor)) validConversionFee(_maxConversionFee) { anchor = _anchor; maxConversionFee = _maxConversionFee; } // ensures that the converter is active modifier active() { _active(); _; } // error message binary size optimization function _active() internal view { require(isActive(), "ERR_INACTIVE"); } // ensures that the converter is not active modifier inactive() { _inactive(); _; } // error message binary size optimization function _inactive() internal view { require(!isActive(), "ERR_ACTIVE"); } // validates a reserve token address - verifies that the address belongs to one of the reserve tokens modifier validReserve(IERC20Token _address) { _validReserve(_address); _; } // error message binary size optimization function _validReserve(IERC20Token _address) internal view { require(__reserveIds[_address] != 0, "ERR_INVALID_RESERVE"); } // validates conversion fee modifier validConversionFee(uint32 _conversionFee) { _validConversionFee(_conversionFee); _; } // error message binary size optimization function _validConversionFee(uint32 _conversionFee) internal pure { require(_conversionFee <= PPM_RESOLUTION, "ERR_INVALID_CONVERSION_FEE"); } // validates reserve weight modifier validReserveWeight(uint32 _weight) { _validReserveWeight(_weight); _; } // error message binary size optimization function _validReserveWeight(uint32 _weight) internal pure { require(_weight == PPM_RESOLUTION / 2, "ERR_INVALID_RESERVE_WEIGHT"); } /** * @dev returns the converter type * * @return see the converter types in the the main contract doc */ function converterType() public pure override returns (uint16) { return 3; } /** * @dev deposits ether * can only be called if the converter has an ETH reserve */ receive() external payable override validReserve(ETH_RESERVE_ADDRESS) {} /** * @dev withdraws ether * can only be called by the owner if the converter is inactive or by upgrader contract * can only be called after the upgrader contract has accepted the ownership of this contract * can only be called if the converter has an ETH reserve * * @param _to address to send the ETH to */ function withdrawETH(address payable _to) public override protected ownerOnly validReserve(ETH_RESERVE_ADDRESS) { address converterUpgrader = addressOf(CONVERTER_UPGRADER); // verify that the converter is inactive or that the owner is the upgrader contract require(!isActive() || owner == converterUpgrader, "ERR_ACCESS_DENIED"); _to.transfer(address(this).balance); // sync the ETH reserve balance syncReserveBalance(ETH_RESERVE_ADDRESS); } /** * @dev checks whether or not the converter version is 28 or higher * * @return true, since the converter version is 28 or higher */ function isV28OrHigher() public pure returns (bool) { return true; } /** * @dev returns true if the converter is active, false otherwise * * @return true if the converter is active, false otherwise */ function isActive() public view virtual override returns (bool) { return anchor.owner() == address(this); } /** * @dev transfers the anchor ownership * the new owner needs to accept the transfer * can only be called by the converter upgrder while the upgrader is the owner * note that prior to version 28, you should use 'transferAnchorOwnership' instead * * @param _newOwner new token owner */ function transferAnchorOwnership(address _newOwner) public override ownerOnly only(CONVERTER_UPGRADER) { anchor.transferOwnership(_newOwner); } /** * @dev accepts ownership of the anchor after an ownership transfer * most converters are also activated as soon as they accept the anchor ownership * can only be called by the contract owner * note that prior to version 28, you should use 'acceptTokenOwnership' instead */ function acceptAnchorOwnership() public virtual override ownerOnly { // verify the the converter has exactly two reserves require(reserveTokenCount() == 2, "ERR_INVALID_RESERVE_COUNT"); anchor.acceptOwnership(); syncReserveBalances(); emit Activation(converterType(), anchor, true); } /** * @dev updates the current conversion fee * can only be called by the contract owner * * @param _conversionFee new conversion fee, represented in ppm */ function setConversionFee(uint32 _conversionFee) public override ownerOnly { require(_conversionFee <= maxConversionFee, "ERR_INVALID_CONVERSION_FEE"); emit ConversionFeeUpdate(conversionFee, _conversionFee); conversionFee = _conversionFee; } /** * @dev withdraws tokens held by the converter and sends them to an account * can only be called by the owner * note that reserve tokens can only be withdrawn by the owner while the converter is inactive * unless the owner is the converter upgrader contract * * @param _token ERC20 token contract address * @param _to account to receive the new amount * @param _amount amount to withdraw */ function withdrawTokens( IERC20Token _token, address _to, uint256 _amount ) public override(IConverter, TokenHolder) protected ownerOnly { address converterUpgrader = addressOf(CONVERTER_UPGRADER); uint256 reserveId = __reserveIds[_token]; // if the token is not a reserve token, allow withdrawal // otherwise verify that the converter is inactive or that the owner is the upgrader contract require(reserveId == 0 || !isActive() || owner == converterUpgrader, "ERR_ACCESS_DENIED"); super.withdrawTokens(_token, _to, _amount); // if the token is a reserve token, sync the reserve balance if (reserveId != 0) { syncReserveBalance(_token); } } /** * @dev upgrades the converter to the latest version * can only be called by the owner * note that the owner needs to call acceptOwnership on the new converter after the upgrade */ function upgrade() public ownerOnly { IConverterUpgrader converterUpgrader = IConverterUpgrader(addressOf(CONVERTER_UPGRADER)); // trigger de-activation event emit Activation(converterType(), anchor, false); transferOwnership(address(converterUpgrader)); converterUpgrader.upgrade(version); acceptOwnership(); } /** * @dev returns the number of reserve tokens * note that prior to version 17, you should use 'connectorTokenCount' instead * * @return number of reserve tokens */ function reserveTokenCount() public view returns (uint16) { return uint16(__reserveTokens.length); } /** * @dev returns the array of reserve tokens * * @return array of reserve tokens */ function reserveTokens() public view returns (IERC20Token[] memory) { return __reserveTokens; } /** * @dev defines a new reserve token for the converter * can only be called by the owner while the converter is inactive * * @param _token address of the reserve token * @param _weight reserve weight, represented in ppm, 1-1000000 */ function addReserve(IERC20Token _token, uint32 _weight) public virtual override ownerOnly inactive validAddress(address(_token)) notThis(address(_token)) validReserveWeight(_weight) { // validate input require(address(_token) != address(anchor) && __reserveIds[_token] == 0, "ERR_INVALID_RESERVE"); require(reserveTokenCount() < 2, "ERR_INVALID_RESERVE_COUNT"); __reserveTokens.push(_token); __reserveIds[_token] = __reserveTokens.length; } /** * @dev returns the reserve's weight * added in version 28 * * @param _reserveToken reserve token contract address * * @return reserve weight */ function reserveWeight(IERC20Token _reserveToken) public view validReserve(_reserveToken) returns (uint32) { return PPM_RESOLUTION / 2; } /** * @dev returns the balance of a given reserve token * * @param _reserveToken reserve token contract address * * @return the balance of the given reserve token */ function reserveBalance(IERC20Token _reserveToken) public view override returns (uint256) { uint256 reserveId = __reserveIds[_reserveToken]; require(reserveId != 0, "ERR_INVALID_RESERVE"); return reserveBalance(reserveId); } /** * @dev returns the balances of both reserve tokens * * @return the balances of both reserve tokens */ function reserveBalances() public view returns (uint256, uint256) { return reserveBalances(1, 2); } /** * @dev converts a specific amount of source tokens to target tokens * can only be called by the bancor network contract * * @param _sourceToken source ERC20 token * @param _targetToken target ERC20 token * @param _amount amount of tokens to convert (in units of the source token) * @param _trader address of the caller who executed the conversion * @param _beneficiary wallet to receive the conversion result * * @return amount of tokens received (in units of the target token) */ function convert( IERC20Token _sourceToken, IERC20Token _targetToken, uint256 _amount, address _trader, address payable _beneficiary ) public payable override protected only(BANCOR_NETWORK) returns (uint256) { // validate input require(_sourceToken != _targetToken, "ERR_SAME_SOURCE_TARGET"); return doConvert(_sourceToken, _targetToken, _amount, _trader, _beneficiary); } /** * @dev returns the conversion fee for a given target amount * * @param _targetAmount target amount * * @return conversion fee */ function calculateFee(uint256 _targetAmount) internal view returns (uint256) { return _targetAmount.mul(conversionFee) / PPM_RESOLUTION; } /** * @dev loads the stored reserve balance for a given reserve id * * @param _reserveId reserve id */ function reserveBalance(uint256 _reserveId) internal view returns (uint256) { return decodeReserveBalance(__reserveBalances, _reserveId); } /** * @dev loads the stored reserve balances * * @param _sourceId source reserve id * @param _targetId target reserve id */ function reserveBalances(uint256 _sourceId, uint256 _targetId) internal view returns (uint256, uint256) { require((_sourceId == 1 && _targetId == 2) || (_sourceId == 2 && _targetId == 1), "ERR_INVALID_RESERVES"); return decodeReserveBalances(__reserveBalances, _sourceId, _targetId); } /** * @dev stores the stored reserve balance for a given reserve id * * @param _reserveId reserve id * @param _reserveBalance reserve balance */ function setReserveBalance(uint256 _reserveId, uint256 _reserveBalance) internal { require(_reserveBalance <= MAX_UINT128, "ERR_RESERVE_BALANCE_OVERFLOW"); uint256 otherBalance = decodeReserveBalance(__reserveBalances, 3 - _reserveId); __reserveBalances = encodeReserveBalances(_reserveBalance, _reserveId, otherBalance, 3 - _reserveId); } /** * @dev stores the stored reserve balances * * @param _sourceId source reserve id * @param _targetId target reserve id * @param _sourceBalance source reserve balance * @param _targetBalance target reserve balance */ function setReserveBalances( uint256 _sourceId, uint256 _targetId, uint256 _sourceBalance, uint256 _targetBalance ) internal { require(_sourceBalance <= MAX_UINT128 && _targetBalance <= MAX_UINT128, "ERR_RESERVE_BALANCE_OVERFLOW"); __reserveBalances = encodeReserveBalances(_sourceBalance, _sourceId, _targetBalance, _targetId); } /** * @dev syncs the stored reserve balance for a given reserve with the real reserve balance * * @param _reserveToken address of the reserve token */ function syncReserveBalance(IERC20Token _reserveToken) internal { uint256 reserveId = __reserveIds[_reserveToken]; uint256 balance = _reserveToken == ETH_RESERVE_ADDRESS ? address(this).balance : _reserveToken.balanceOf(address(this)); setReserveBalance(reserveId, balance); } /** * @dev syncs all stored reserve balances */ function syncReserveBalances() internal { IERC20Token _reserveToken0 = __reserveTokens[0]; IERC20Token _reserveToken1 = __reserveTokens[1]; uint256 balance0 = _reserveToken0 == ETH_RESERVE_ADDRESS ? address(this).balance : _reserveToken0.balanceOf(address(this)); uint256 balance1 = _reserveToken1 == ETH_RESERVE_ADDRESS ? address(this).balance : _reserveToken1.balanceOf(address(this)); setReserveBalances(1, 2, balance0, balance1); } /** * @dev syncs all stored reserve balances, excluding a given amount of ether from the ether reserve balance (if relevant) * * @param _value amount of ether to exclude from the ether reserve balance (if relevant) */ function syncReserveBalances(uint256 _value) internal { IERC20Token _reserveToken0 = __reserveTokens[0]; IERC20Token _reserveToken1 = __reserveTokens[1]; uint256 balance0 = _reserveToken0 == ETH_RESERVE_ADDRESS ? address(this).balance - _value : _reserveToken0.balanceOf(address(this)); uint256 balance1 = _reserveToken1 == ETH_RESERVE_ADDRESS ? address(this).balance - _value : _reserveToken1.balanceOf(address(this)); setReserveBalances(1, 2, balance0, balance1); } /** * @dev helper, dispatches the Conversion event * * @param _sourceToken source ERC20 token * @param _targetToken target ERC20 token * @param _trader address of the caller who executed the conversion * @param _amount amount purchased/sold (in the source token) * @param _returnAmount amount returned (in the target token) */ function dispatchConversionEvent( IERC20Token _sourceToken, IERC20Token _targetToken, address _trader, uint256 _amount, uint256 _returnAmount, uint256 _feeAmount ) internal { emit Conversion(_sourceToken, _targetToken, _trader, _amount, _returnAmount, int256(_feeAmount)); } /** * @dev returns the expected target amount of converting one reserve to another along with the fee * * @param _sourceToken contract address of the source reserve token * @param _targetToken contract address of the target reserve token * @param _amount amount of tokens received from the user * * @return expected target amount * @return expected fee */ function targetAmountAndFee( IERC20Token _sourceToken, IERC20Token _targetToken, uint256 _amount ) public view override active returns (uint256, uint256) { uint256 sourceId = __reserveIds[_sourceToken]; uint256 targetId = __reserveIds[_targetToken]; (uint256 sourceBalance, uint256 targetBalance) = reserveBalances(sourceId, targetId); uint256 amount = crossReserveTargetAmount(sourceBalance, targetBalance, _amount); // return the amount minus the conversion fee and the conversion fee uint256 fee = calculateFee(amount); return (amount - fee, fee); } /** * @dev converts a specific amount of source tokens to target tokens * * @param _sourceToken source ERC20 token * @param _targetToken target ERC20 token * @param _amount amount of tokens to convert (in units of the source token) * @param _trader address of the caller who executed the conversion * @param _beneficiary wallet to receive the conversion result * * @return amount of tokens received (in units of the target token) */ function doConvert( IERC20Token _sourceToken, IERC20Token _targetToken, uint256 _amount, address _trader, address payable _beneficiary ) internal returns (uint256) { // update the recent average rate updateRecentAverageRate(); uint256 sourceId = __reserveIds[_sourceToken]; uint256 targetId = __reserveIds[_targetToken]; (uint256 sourceBalance, uint256 targetBalance) = reserveBalances(sourceId, targetId); uint256 targetAmount = crossReserveTargetAmount(sourceBalance, targetBalance, _amount); // get the target amount minus the conversion fee and the conversion fee uint256 fee = calculateFee(targetAmount); uint256 amount = targetAmount - fee; // ensure that the trade gives something in return require(amount != 0, "ERR_ZERO_TARGET_AMOUNT"); // ensure that the trade won't deplete the reserve balance assert(amount < targetBalance); // ensure that the input amount was already deposited uint256 actualSourceBalance; if (_sourceToken == ETH_RESERVE_ADDRESS) { actualSourceBalance = address(this).balance; require(msg.value == _amount, "ERR_ETH_AMOUNT_MISMATCH"); } else { actualSourceBalance = _sourceToken.balanceOf(address(this)); require(msg.value == 0 && actualSourceBalance.sub(sourceBalance) >= _amount, "ERR_INVALID_AMOUNT"); } // sync the reserve balances setReserveBalances(sourceId, targetId, actualSourceBalance, targetBalance - amount); // transfer funds to the beneficiary in the to reserve token if (_targetToken == ETH_RESERVE_ADDRESS) { _beneficiary.transfer(amount); } else { safeTransfer(_targetToken, _beneficiary, amount); } // dispatch the conversion event dispatchConversionEvent(_sourceToken, _targetToken, _trader, _amount, amount, fee); // dispatch rate updates dispatchTokenRateUpdateEvents(_sourceToken, _targetToken, actualSourceBalance, targetBalance - amount); return amount; } /** * @dev returns the recent average rate of 1 `_token` in the other reserve token units * * @param _token token to get the rate for * @return recent average rate between the reserves (numerator) * @return recent average rate between the reserves (denominator) */ function recentAverageRate(IERC20Token _token) external view validReserve(_token) returns (uint256, uint256) { // get the recent average rate of reserve 0 uint256 rate = calcRecentAverageRate(averageRateInfo); uint256 rateN = decodeAverageRateN(rate); uint256 rateD = decodeAverageRateD(rate); if (_token == __reserveTokens[0]) { return (rateN, rateD); } return (rateD, rateN); } /** * @dev updates the recent average rate if needed */ function updateRecentAverageRate() internal { uint256 averageRateInfo1 = averageRateInfo; uint256 averageRateInfo2 = calcRecentAverageRate(averageRateInfo1); if (averageRateInfo1 != averageRateInfo2) { averageRateInfo = averageRateInfo2; } } /** * @dev returns the recent average rate of 1 reserve token 0 in reserve token 1 units * * @param _averageRateInfo a local copy of the `averageRateInfo` state-variable * @return recent average rate between the reserves */ function calcRecentAverageRate(uint256 _averageRateInfo) internal view returns (uint256) { // get the previous average rate and its update-time uint256 prevAverageRateT = decodeAverageRateT(_averageRateInfo); uint256 prevAverageRateN = decodeAverageRateN(_averageRateInfo); uint256 prevAverageRateD = decodeAverageRateD(_averageRateInfo); // get the elapsed time since the previous average rate was calculated uint256 currentTime = time(); uint256 timeElapsed = currentTime - prevAverageRateT; // if the previous average rate was calculated in the current block, the average rate remains unchanged if (timeElapsed == 0) { return _averageRateInfo; } // get the current rate between the reserves (uint256 currentRateD, uint256 currentRateN) = reserveBalances(); // if the previous average rate was calculated a while ago or never, the average rate is equal to the current rate if (timeElapsed >= AVERAGE_RATE_PERIOD || prevAverageRateT == 0) { (currentRateN, currentRateD) = Math.reducedRatio(currentRateN, currentRateD, MAX_UINT112); return encodeAverageRateInfo(currentTime, currentRateN, currentRateD); } uint256 x = prevAverageRateD.mul(currentRateN); uint256 y = prevAverageRateN.mul(currentRateD); // since we know that timeElapsed < AVERAGE_RATE_PERIOD, we can avoid using SafeMath: uint256 newRateN = y.mul(AVERAGE_RATE_PERIOD - timeElapsed).add(x.mul(timeElapsed)); uint256 newRateD = prevAverageRateD.mul(currentRateD).mul(AVERAGE_RATE_PERIOD); (newRateN, newRateD) = Math.reducedRatio(newRateN, newRateD, MAX_UINT112); return encodeAverageRateInfo(currentTime, newRateN, newRateD); } /** * @dev increases the pool's liquidity and mints new shares in the pool to the caller * this version receives the two reserve amounts as separate args * * @param _reserve1Amount amount of the first reserve token * @param _reserve2Amount amount of the second reserve token * @param _minReturn token minimum return-amount * * @return amount of pool tokens issued */ function addLiquidity(uint256 _reserve1Amount, uint256 _reserve2Amount, uint256 _minReturn) public payable returns (uint256) { uint256[] memory reserveAmounts = new uint256[](2); reserveAmounts[0] = _reserve1Amount; reserveAmounts[1] = _reserve2Amount; return addLiquidity(__reserveTokens, reserveAmounts, _minReturn); } /** * @dev increases the pool's liquidity and mints new shares in the pool to the caller * * @param _reserveTokens address of each reserve token * @param _reserveAmounts amount of each reserve token * @param _minReturn token minimum return-amount * * @return amount of pool tokens issued */ function addLiquidity( IERC20Token[] memory _reserveTokens, uint256[] memory _reserveAmounts, uint256 _minReturn ) public payable protected active returns (uint256) { // verify the user input verifyLiquidityInput(_reserveTokens, _reserveAmounts, _minReturn); // if one of the reserves is ETH, then verify that the input amount of ETH is equal to the input value of ETH for (uint256 i = 0; i < 2; i++) { if (_reserveTokens[i] == ETH_RESERVE_ADDRESS) { require(_reserveAmounts[i] == msg.value, "ERR_ETH_AMOUNT_MISMATCH"); } } // if the input value of ETH is larger than zero, then verify that one of the reserves is ETH if (msg.value > 0) { require(__reserveIds[ETH_RESERVE_ADDRESS] != 0, "ERR_NO_ETH_RESERVE"); } // save a local copy of the pool token IDSToken poolToken = IDSToken(address(anchor)); // get the total supply uint256 totalSupply = poolToken.totalSupply(); // sync the balances to ensure no mismatch syncReserveBalances(msg.value); uint256[2] memory oldReserveBalances; uint256[2] memory newReserveBalances; (oldReserveBalances[0], oldReserveBalances[1]) = reserveBalances(); // calculate the amount of pool tokens to mint uint256 amount; uint256[] memory reserveAmounts = new uint256[](2); if (totalSupply == 0) { for (uint256 i = 0; i < 2; i++) { reserveAmounts[i] = _reserveAmounts[i]; } amount = Math.geometricMean(reserveAmounts); } else { uint256 index = (_reserveAmounts[0].mul(oldReserveBalances[1]) < _reserveAmounts[1].mul(oldReserveBalances[0])) ? 0 : 1; amount = fundSupplyAmount(totalSupply, oldReserveBalances[index], _reserveAmounts[index]); for (uint256 i = 0; i < 2; i++) { reserveAmounts[i] = fundCost(totalSupply, oldReserveBalances[i], amount); } } uint256 newPoolTokenSupply = totalSupply.add(amount); for (uint256 i = 0; i < 2; i++) { IERC20Token reserveToken = _reserveTokens[i]; uint256 reserveAmount = reserveAmounts[i]; require(reserveAmount > 0, "ERR_ZERO_TARGET_AMOUNT"); assert(reserveAmount <= _reserveAmounts[i]); // transfer each one of the reserve amounts from the user to the pool if (reserveToken != ETH_RESERVE_ADDRESS) { // ETH has already been transferred as part of the transaction safeTransferFrom(reserveToken, msg.sender, address(this), reserveAmount); } else if (_reserveAmounts[i] > reserveAmount) { // transfer the extra amount of ETH back to the user msg.sender.transfer(_reserveAmounts[i] - reserveAmount); } // save the new reserve balance newReserveBalances[i] = oldReserveBalances[i].add(reserveAmount); emit LiquidityAdded(msg.sender, reserveToken, reserveAmount, newReserveBalances[i], newPoolTokenSupply); // dispatch the `TokenRateUpdate` event for the pool token emit TokenRateUpdate(poolToken, reserveToken, newReserveBalances[i], newPoolTokenSupply); } // set the reserve balances setReserveBalances(1, 2, newReserveBalances[0], newReserveBalances[1]); // verify that the equivalent amount of tokens is equal to or larger than the user's expectation require(amount >= _minReturn, "ERR_RETURN_TOO_LOW"); // issue the tokens to the user poolToken.issue(msg.sender, amount); // return the amount of pool tokens issued return amount; } /** * @dev decreases the pool's liquidity and burns the caller's shares in the pool * this version receives the two minimum return amounts as separate args * * @param _amount token amount * @param _reserve1MinReturn minimum return for the first reserve token * @param _reserve2MinReturn minimum return for the second reserve token * * @return the first reserve amount returned * @return the second reserve amount returned */ function removeLiquidity(uint256 _amount, uint256 _reserve1MinReturn, uint256 _reserve2MinReturn) public returns (uint256, uint256) { uint256[] memory minReturnAmounts = new uint256[](2); minReturnAmounts[0] = _reserve1MinReturn; minReturnAmounts[1] = _reserve2MinReturn; uint256[] memory reserveAmounts = removeLiquidity(_amount, __reserveTokens, minReturnAmounts); return (reserveAmounts[0], reserveAmounts[1]); } /** * @dev decreases the pool's liquidity and burns the caller's shares in the pool * * @param _amount token amount * @param _reserveTokens address of each reserve token * @param _reserveMinReturnAmounts minimum return-amount of each reserve token * * @return the amount of each reserve token granted for the given amount of pool tokens */ function removeLiquidity( uint256 _amount, IERC20Token[] memory _reserveTokens, uint256[] memory _reserveMinReturnAmounts ) public protected active returns (uint256[] memory) { // verify the user input bool inputRearranged = verifyLiquidityInput(_reserveTokens, _reserveMinReturnAmounts, _amount); // save a local copy of the pool token IDSToken poolToken = IDSToken(address(anchor)); // get the total supply BEFORE destroying the user tokens uint256 totalSupply = poolToken.totalSupply(); // destroy the user tokens poolToken.destroy(msg.sender, _amount); // sync the balances to ensure no mismatch syncReserveBalances(); uint256 newPoolTokenSupply = totalSupply.sub(_amount); uint256[] memory reserveAmounts = removeLiquidityReserveAmounts(_amount, _reserveTokens, totalSupply); uint256[2] memory oldReserveBalances; uint256[2] memory newReserveBalances; (oldReserveBalances[0], oldReserveBalances[1]) = reserveBalances(); for (uint256 i = 0; i < 2; i++) { IERC20Token reserveToken = _reserveTokens[i]; uint256 reserveAmount = reserveAmounts[i]; require(reserveAmount >= _reserveMinReturnAmounts[i], "ERR_ZERO_TARGET_AMOUNT"); // save the new reserve balance newReserveBalances[i] = oldReserveBalances[i].sub(reserveAmount); // transfer each one of the reserve amounts from the pool to the user if (reserveToken == ETH_RESERVE_ADDRESS) { msg.sender.transfer(reserveAmount); } else { safeTransfer(reserveToken, msg.sender, reserveAmount); } emit LiquidityRemoved(msg.sender, reserveToken, reserveAmount, newReserveBalances[i], newPoolTokenSupply); // dispatch the `TokenRateUpdate` event for the pool token emit TokenRateUpdate(poolToken, reserveToken, newReserveBalances[i], newPoolTokenSupply); } // set the reserve balances setReserveBalances(1, 2, newReserveBalances[0], newReserveBalances[1]); if (inputRearranged) { uint256 tempReserveAmount = reserveAmounts[0]; reserveAmounts[0] = reserveAmounts[1]; reserveAmounts[1] = tempReserveAmount; } // return the amount of each reserve token granted for the given amount of pool tokens return reserveAmounts; } /** * @dev given the amount of one of the reserve tokens to add liquidity of, * returns the required amount of each one of the other reserve tokens * since an empty pool can be funded with any list of non-zero input amounts, * this function assumes that the pool is not empty (has already been funded) * * @param _reserveTokens address of each reserve token * @param _reserveTokenIndex index of the relevant reserve token * @param _reserveAmount amount of the relevant reserve token * * @return the required amount of each one of the reserve tokens */ function addLiquidityCost( IERC20Token[] memory _reserveTokens, uint256 _reserveTokenIndex, uint256 _reserveAmount ) public view returns (uint256[] memory) { uint256[] memory _reserveAmounts = new uint256[](2); uint256[] memory _reserveBalances = new uint256[](2); uint256 reserve0Id = __reserveIds[_reserveTokens[0]]; uint256 reserve1Id = __reserveIds[_reserveTokens[1]]; (_reserveBalances[0], _reserveBalances[1]) = reserveBalances(reserve0Id, reserve1Id); uint256 totalSupply = IDSToken(address(anchor)).totalSupply(); uint256 amount = fundSupplyAmount(totalSupply, _reserveBalances[_reserveTokenIndex], _reserveAmount); for (uint256 i = 0; i < 2; i++) _reserveAmounts[i] = fundCost(totalSupply, _reserveBalances[i], amount); return _reserveAmounts; } /** * @dev given the amount of one of the reserve tokens to add liquidity of, * returns the amount of pool tokens entitled for it * since an empty pool can be funded with any list of non-zero input amounts, * this function assumes that the pool is not empty (has already been funded) * * @param _reserveToken address of the reserve token * @param _reserveAmount amount of the reserve token * * @return the amount of pool tokens entitled */ function addLiquidityReturn(IERC20Token _reserveToken, uint256 _reserveAmount) public view returns (uint256) { uint256 totalSupply = IDSToken(address(anchor)).totalSupply(); return fundSupplyAmount(totalSupply, reserveBalance(__reserveIds[_reserveToken]), _reserveAmount); } /** * @dev returns the amount of each reserve token entitled for a given amount of pool tokens * * @param _amount amount of pool tokens * @param _reserveTokens address of each reserve token * * @return the amount of each reserve token entitled for the given amount of pool tokens */ function removeLiquidityReturn(uint256 _amount, IERC20Token[] memory _reserveTokens) public view returns (uint256[] memory) { uint256 totalSupply = IDSToken(address(anchor)).totalSupply(); return removeLiquidityReserveAmounts(_amount, _reserveTokens, totalSupply); } /** * @dev verifies that a given array of tokens is identical to the converter's array of reserve tokens * we take this input in order to allow specifying the corresponding reserve amounts in any order * this function rearranges the input arrays according to the converter's array of reserve tokens * * @param _reserveTokens array of reserve tokens * @param _reserveAmounts array of reserve amounts * @param _amount token amount * * @return true if the function has rearranged the input arrays; false otherwise */ function verifyLiquidityInput( IERC20Token[] memory _reserveTokens, uint256[] memory _reserveAmounts, uint256 _amount ) private view returns (bool) { require(_reserveAmounts[0] > 0 && _reserveAmounts[1] > 0 && _amount > 0, "ERR_ZERO_AMOUNT"); uint256 reserve0Id = __reserveIds[_reserveTokens[0]]; uint256 reserve1Id = __reserveIds[_reserveTokens[1]]; if (reserve0Id == 2 && reserve1Id == 1) { IERC20Token tempReserveToken = _reserveTokens[0]; _reserveTokens[0] = _reserveTokens[1]; _reserveTokens[1] = tempReserveToken; uint256 tempReserveAmount = _reserveAmounts[0]; _reserveAmounts[0] = _reserveAmounts[1]; _reserveAmounts[1] = tempReserveAmount; return true; } require(reserve0Id == 1 && reserve1Id == 2, "ERR_INVALID_RESERVE"); return false; } /** * @dev returns the amount of each reserve token entitled for a given amount of pool tokens * * @param _amount amount of pool tokens * @param _reserveTokens address of each reserve token * @param _totalSupply token total supply * * @return the amount of each reserve token entitled for the given amount of pool tokens */ function removeLiquidityReserveAmounts( uint256 _amount, IERC20Token[] memory _reserveTokens, uint256 _totalSupply ) private view returns (uint256[] memory) { uint256[] memory _reserveAmounts = new uint256[](2); uint256[] memory _reserveBalances = new uint256[](2); uint256 reserve0Id = __reserveIds[_reserveTokens[0]]; uint256 reserve1Id = __reserveIds[_reserveTokens[1]]; (_reserveBalances[0], _reserveBalances[1]) = reserveBalances(reserve0Id, reserve1Id); for (uint256 i = 0; i < 2; i++) _reserveAmounts[i] = liquidateReserveAmount(_totalSupply, _reserveBalances[i], _amount); return _reserveAmounts; } /** * @dev dispatches token rate update events for the reserve tokens and the pool token * * @param _sourceToken address of the source reserve token * @param _targetToken address of the target reserve token * @param _sourceBalance balance of the source reserve token * @param _targetBalance balance of the target reserve token */ function dispatchTokenRateUpdateEvents( IERC20Token _sourceToken, IERC20Token _targetToken, uint256 _sourceBalance, uint256 _targetBalance ) private { // save a local copy of the pool token IDSToken poolToken = IDSToken(address(anchor)); // get the total supply of pool tokens uint256 poolTokenSupply = poolToken.totalSupply(); // dispatch token rate update event for the reserve tokens emit TokenRateUpdate(_sourceToken, _targetToken, _targetBalance, _sourceBalance); // dispatch token rate update events for the pool token emit TokenRateUpdate(poolToken, _sourceToken, _sourceBalance, poolTokenSupply); emit TokenRateUpdate(poolToken, _targetToken, _targetBalance, poolTokenSupply); } function encodeReserveBalance(uint256 _balance, uint256 _id) private pure returns (uint256) { assert(_balance <= MAX_UINT128 && (_id == 1 || _id == 2)); return _balance << ((_id - 1) * 128); } function decodeReserveBalance(uint256 _balances, uint256 _id) private pure returns (uint256) { assert(_id == 1 || _id == 2); return (_balances >> ((_id - 1) * 128)) & MAX_UINT128; } function encodeReserveBalances( uint256 _balance0, uint256 _id0, uint256 _balance1, uint256 _id1 ) private pure returns (uint256) { return encodeReserveBalance(_balance0, _id0) | encodeReserveBalance(_balance1, _id1); } function decodeReserveBalances( uint256 _balances, uint256 _id0, uint256 _id1 ) private pure returns (uint256, uint256) { return (decodeReserveBalance(_balances, _id0), decodeReserveBalance(_balances, _id1)); } function encodeAverageRateInfo( uint256 _averageRateT, uint256 _averageRateN, uint256 _averageRateD ) private pure returns (uint256) { assert(_averageRateT <= MAX_UINT32 && _averageRateN <= MAX_UINT112 && _averageRateD <= MAX_UINT112); return (_averageRateT << 224) | (_averageRateN << 112) | _averageRateD; } function decodeAverageRateT(uint256 _averageRateInfo) private pure returns (uint256) { return _averageRateInfo >> 224; } function decodeAverageRateN(uint256 _averageRateInfo) private pure returns (uint256) { return (_averageRateInfo >> 112) & MAX_UINT112; } function decodeAverageRateD(uint256 _averageRateInfo) private pure returns (uint256) { return _averageRateInfo & MAX_UINT112; } function crossReserveTargetAmount( uint256 _sourceReserveBalance, uint256 _targetReserveBalance, uint256 _amount ) private pure returns (uint256) { // validate input require(_sourceReserveBalance > 0 && _targetReserveBalance > 0, "ERR_INVALID_RESERVE_BALANCE"); return _targetReserveBalance.mul(_amount) / _sourceReserveBalance.add(_amount); } function fundCost( uint256 _supply, uint256 _reserveBalance, uint256 _amount ) private pure returns (uint256) { // validate input require(_supply > 0, "ERR_INVALID_SUPPLY"); require(_reserveBalance > 0, "ERR_INVALID_RESERVE_BALANCE"); // special case for 0 amount if (_amount == 0) { return 0; } return (_amount.mul(_reserveBalance) - 1) / _supply + 1; } function fundSupplyAmount( uint256 _supply, uint256 _reserveBalance, uint256 _amount ) private pure returns (uint256) { // validate input require(_supply > 0, "ERR_INVALID_SUPPLY"); require(_reserveBalance > 0, "ERR_INVALID_RESERVE_BALANCE"); // special case for 0 amount if (_amount == 0) { return 0; } return _amount.mul(_supply) / _reserveBalance; } function liquidateReserveAmount( uint256 _supply, uint256 _reserveBalance, uint256 _amount ) private pure returns (uint256) { // validate input require(_supply > 0, "ERR_INVALID_SUPPLY"); require(_reserveBalance > 0, "ERR_INVALID_RESERVE_BALANCE"); require(_amount <= _supply, "ERR_INVALID_AMOUNT"); // special case for 0 amount if (_amount == 0) { return 0; } // special case for liquidating the entire supply if (_amount == _supply) { return _reserveBalance; } return _amount.mul(_reserveBalance) / _supply; } /** * @dev deprecated since version 28, backward compatibility - use only for earlier versions */ function token() public view override returns (IConverterAnchor) { return anchor; } /** * @dev deprecated, backward compatibility */ function transferTokenOwnership(address _newOwner) public override ownerOnly { transferAnchorOwnership(_newOwner); } /** * @dev deprecated, backward compatibility */ function acceptTokenOwnership() public override ownerOnly { acceptAnchorOwnership(); } /** * @dev deprecated, backward compatibility */ function connectors(IERC20Token _address) public view override returns ( uint256, uint32, bool, bool, bool ) { uint256 reserveId = __reserveIds[_address]; if (reserveId != 0) { return (reserveBalance(reserveId), PPM_RESOLUTION / 2, false, false, true); } return (0, 0, false, false, false); } /** * @dev deprecated, backward compatibility */ function connectorTokens(uint256 _index) public view override returns (IERC20Token) { return __reserveTokens[_index]; } /** * @dev deprecated, backward compatibility */ function connectorTokenCount() public view override returns (uint16) { return reserveTokenCount(); } /** * @dev deprecated, backward compatibility */ function getConnectorBalance(IERC20Token _connectorToken) public view override returns (uint256) { return reserveBalance(_connectorToken); } /** * @dev deprecated, backward compatibility */ function getReturn( IERC20Token _sourceToken, IERC20Token _targetToken, uint256 _amount ) public view returns (uint256, uint256) { return targetAmountAndFee(_sourceToken, _targetToken, _amount); } }
Contract Security Audit
- No Contract Security Audit Submitted- Submit Audit Here
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IConverterAnchor","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"averageRateInfo","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"connectorTokenCount","outputs":[{"internalType":"uint16","name":"","type":"uint16"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"_index","type":"uint256"}],"name":"connectorTokens","outputs":[{"internalType":"contract IERC20Token","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"contract 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Bancor converter address.Multichain Portfolio | 30 Chains
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A contract address hosts a smart contract, which is a set of code stored on the blockchain that runs when predetermined conditions are met. Learn more about addresses in our Knowledge Base.